717results about How to "Improve heat exchange capacity" patented technology

This invention provides a thermal energy battery having an insulated tank contains a multitude of densely packed plastic tubes filled with a phase-change material (PCM, such as ice) that changes from solid to liquid and vice-versa. Energy is stored when the PCM transitions from liquid to solid form, and released when the PCM transitions back from solid to liquid form. The tubes are arranged vertically, span the height of a well-insulated tank, and are immersed in heat transfer fluid (HTF) contained within the tank. The HTF is an aqueous solution with a freezing point temperature below the freezing point temperature of the chosen PCM. The HTF remains in liquid form at all times during the operation of the battery. Diffusers located allow the HTF to be extracted uniformly from the tank, pumped and cooled by a liquid chiller situated outside the tank and then and inserted back into the tank.

To provide a heat pump water heater outdoor unit and heat pump water heater capable of preventing reduction in heating/hot water supply ability even at a low ambient temperature. A heat pump water heater outdoor unit, in which a compressor, a water heat exchanger, a first expansion valve, and an air heat exchanger are connected with piping, includes a first internal heat exchanger provided between the water heat exchanger and the first expansion valve and used for heat exchange between a refrigerant flowing between the water heat exchanger and the first expansion valve and a refrigerant flowing between the air heat exchanger and the compressor, an injection circuit branching off at a point between the first internal heat exchanger and the first expansion valve and to inject the refrigerant into the compressor through a second expansion valve; and a second internal heat exchanger for heat exchange between the refrigerant flowing between the first internal heat exchanger and the first expansion valve and the refrigerant flowing between the second expansion valve and the compressor in the injection circuit.

The invention discloses an ultra-high strength steel plate thermal die cutting and forming die, comprising an upper die seat and a convex die which is fixed on the upper die seat, a lower die seat and a concave die that is fixed on the lower die seat; the concave die is internally provided with a cooling water passage which is connected with a cooling water circulation system. More particularly, the concave die is compose of a trough-shaped concave die seat and a cavity body; the concave die seat is provided with a water inlet and a water outlet; the cavity body is arranged in the concave trough of the concave die seat; a gap is arranged between the cavity body and the concave die seat; the gap is communicated with the water inlet and the water outlet. The die improves cooling speed, ensures the uniformity of cooling, has simple and practical structure, and fast cools the die and the punching parts in the die by the water cooling system of the die, so as to achieve the effect of quenching. As the process is completed under the pressure preservation process of the die, the workpiece has extremely small deformation and the dimension precision of the punching part can be excellently ensured.

A loop-type heat exchange device (10) is disclosed, which includes an evaporator (20), a condenser (40), a vapor conduit (30) and a liquid conduit (50). The evaporator contains therein a working fluid. The working fluid in the evaporator evaporates into vapor after absorbing heat, and the generated vapor flows, via the vapor conduit, to the condenser where the vapor releases its latent heat of evaporation and is condensed into condensate. The condensate then returns back, via the liquid conduit, to the evaporator to thereby form a heat transfer loop. The condenser defines therein a chamber, and a plurality of heat-exchange pins is provided inside the chamber for effectively exchanging heat with the vapor entering into the condenser.

A heat exchanger having excellent heat exchanging performance is obtainable by a simple production technique and at a low cost. This is achieved by providing a fin member and by increasing heat conductivity between the fin member and a meandering pipe body. Further, the heat exchanger is made compact for high degrees of layout freedom, enabling the heat exchanger to be installed in a tight space. Engagement grooves are provided in both end surfaces, which are opposite to each other, of a fin member in which fins are parallel arranged. Straight pipe sections are parallelly arranged, with gaps in between, in the engagement grooves of the fin member. The straight pipe sections a are connected at bent sections. A pair of meandering sections is arranged opposite to each other with an insertion gap of the fin member in between. On of the meandering sections and the other meandering section are connected by a connection pipe to form a meandering pipe main body. The straight pipe sections of the one meandering section are arranged in the engagement grooves in the one end surface of the fin member inserted and arranged in the insertion gap between the one meandering section and the other meandering section of the meandering pipe body, and the straight pipe sections of the other meandering section are arranged and fixed in the engagement grooves in the other end surface.

A heat exchanger (1) includes: a heat sink (3) which is in contact with a heating element (2); and an electron emitting element (4) which is provided so as to be separated from the heat sink (3) by a space and which provides electrons to the heat sink (3) via air in the space. The electron emitting element (4) includes: an electrode substrate (7); a thin-film electrode (9); a power supply (10) which applies a voltage between the electrode substrate (7) and the thin-film electrode (8); and an electron acceleration layer (8) which accelerates the electrons inside itself in response to the voltage applied by the power supply (10) so that the electrons are emitted from the thin-film electrode (9). The electron acceleration layer (8) is made at least partially of an insulating material. As a result, the heat exchanger (1) has a heat exchange capability which can be maintained and improved independently of a structure in which electric field concentration tends to occur.

The invention relates to a method for producing acrylic acid in one step by an oxydehydration reaction of glycerol in the presence of molecular oxygen. The reaction preferably carried out in gaseous phase in the presence of a suitable catalyst.

A heat pump device 20 includes an air conditioning control device 22 configured to switch the heat pump device 20 among a plurality of operation modes including an air-heating operation mode in which an indoor heat exchanger 32 serves as a radiator and an outdoor heat exchanger 33 serves as a heat absorber, and an air-cooling operation mode in which the indoor heat exchanger 32 serves as a heat absorber and the outdoor heat exchanger 33 serves as a radiator. The air conditioning control device 22 switch a refrigerant pipe such that refrigerant is, in the air-cooling operation mode, supplied to part of the outdoor heat exchanger 33 serving as a refrigerant inlet in the air-heating operation mode.

A hollow passage in a machine element for enhancing the heat exchanging properties between the machine element and a fluid flowing through the hollow passage; the hollow passage including a helicoidal groove. In some embodiments, the machine element comprises a heated machine element and the fluid comprises a coolant. In some embodiments, the machine element comprises a stator blade or a rotor blade of a gas turbine engine and the coolant comprises compressed air. In some embodiments, the helicoidal groove comprises a depression in an outer wall of the hollow passage that extends axially along the hollow passage to form a helicoidal or swirling path.

A corrugate fin 14 of an evaporator 1 includes wave crest portions 14a, wave trough portions 14b, and flat connection portions 14c connecting together the wave crest portions 14a and the wave trough portions 14b. Opposite end portions of a cutout 95 extend to corresponding connection portions 14c located at opposite ends of the wave crest portion 14a and the wave trough portion 14b. A projection 96 projecting inward is formed integrally with end portions of the connection portions 14c, the end portions of the connection portions 14c corresponding to opposite ends of the cutout 95. The projection 96 is formed in such a manner as to extend between the end portions of the connection portions 14c located at the opposite ends of the wave crest portion 14a and the wave trough portion 14c. The projection 96 projects inward in a shape resembling a lying letter V. The evaporator 1 exhibits excellent drainage of condensed water and enables high work efficiency in manufacture thereof.

The invention provides a heat pump-type hot-water supply device which includes a heat source-side heat pump unit having a radiation heat exchanger for radiating heat from refrigerant by condensing therefrigerant. The hot-water supply device further includes a hot-water supply unit having a water tank where water is contained, water supply piping for supplying external water into the water tank, water circulation piping communicating with both a bottom section and an upper section of the water tank and circulating water in the bottom section to the upper section of the water tank in a bypassing manner, an absorption heat exchanger located in the middle of the water circulation piping and joined to the radiation heat exchanger of the heat source-side heat pump unit such that the absorptionheat exchanger can absorb heat, and a hot-water supply unit for supplying hot water in the upper section of the water tank to the outside. The water supply piping is branched off into a first water supply route and a second water supply route. The first water supply route supplies, without treatment, the water supplied from the outside into the water tank, and the second water supply route supplies the water from the outside into the water tank after improving the quality of the water by a water quality adjustment unit so that the water does not produce scale. Either or both of the water supply routes are used appropriately depending on the quality of water supplied. As a result, scale deposition is suppressed.

A heat exchanger includes: a receiving tube into which a fluid is introduced; a discharge tube for discharging a heat-exchanged fluid outwardly; a plurality of pins disposed between the receiving tube and the discharge tube, being bent at regular intervals so that air can pass at an outer circumferential surface thereof, and having a guide unit for guiding condensate water condensed at the surface thereof in one direction; and a tube disposed between the pins for heat-exchanging between a fluid passing therethrough and air passing the outer circumferential surface of the pin, and having a condensate water discharge path for discharging downwardly the condensate water guided by the guide unit. A condensate water remaining phenomenon between the pins can be reduced, and thus, the heat exchanging performance is improved.

The disclosed serpentine heat exchanger for an air conditioner effectively minimizes losses in heat-exchange performance due to condensation and is capable of adequately accommodating efforts to reduce the size of air conditioners. Said serpentine heat exchanger (10) comprises a plurality of fin groups (14) and a heat-exchanger pipe (16). Each fin group (14) is formed by arranging a large number of fins (12), each comprising a metal plate with a prescribed coating layer formed on at least one surface, parallel to each other at intervals of 0.6-5.0 mm in a direction (y direction) perpendicular to the direction (x direction) in which a heat-exchange fluid, namely air, flows. The plurality of fin groups (14) are arranged in a row at a constant distance from each other in a direction (z direction) perpendicular to the x direction and the y direction. The heat-exchanger pipe (16) is laid out in a serpentine configuration so as to penetrate each fin group (14) in turn.

The invention discloses an electrophoresis apparatus and process suitable for an automobile leaf spring. Ball-blasted reeds are subjected to degreasing, parkerizing, water washing and other pretreatments through a conveying chain, then enter an electrophoresis trough, are automatically dried, subjected to strong cold and cooled down after electrophoresis and are finally off-line; the reeds are assembled into a leaf spring assembly after electrophoresis, and the assembly is subject to surface paint spraying through an electrostatic painting line so as to meet the requirements on product corrosion protection and surface colors of clients. The invention overcomes the shortcomings of a conventional leaf spring coating technology, and creates a brand-new leaf spring coating technology-the process route and production equipment adopting leaf spring uniwafer electrophoresis plus assembly surface painting. The process saves energy and labor, achieves high utilization ratio of paint, enables the salt fog resisting capability of the leaf spring to be higher than 300 h, and simultaneously improves and prolongs the surface quality and the service life of the reeds.

The invention relates to a silicon carbide micro-channel heat dissipation structure of a three-dimensional integrated circuit and a manufacturing method thereof, and mainly solves the problem that a micro-channel wall material is low in heat conductivity and small in contact area with the micro-channel wall in the prior art. The silicon carbide micro-channel heat dissipation structure comprises an upper chip (1) and a lower chip (2), wherein each chip comprises a circuit layer (3), a silicon substrate (4), a silicon channel wall (5), a silicon carbide channel wall (6), a micro-channel (7) and a silicon micro-channel cap (8) from top to bottom, wherein each circuit layer is positioned on the top of the front side of the corresponding chip, and each silicon substrate is adjacent to the corresponding circuit layer and is positioned below the corresponding circuit layer; each silicon channel wall is adjacent to the corresponding silicon substrate and is positioned below the corresponding silicon substrate; each silicon carbide channel wall epitaxially grows below the corresponding silicon channel wall; the cross section of each micro-channel is of an integral structure with a semi-elliptical upper part and a rectangular lower part, and each micro-channel is positioned below the corresponding silicon channel wall. The heat dissipation contact area close to the circuit layers is increased, the distances with the circuit layers are shortened, and the heat dissipation performance of the micro-channel heat dissipation structure is improved.

An object of the present invention is to improve a heat exchanging capability in an evaporator in a refrigerant cycle system in which a high pressure side is operated at a supercritical pressure. The refrigerant cycle system is a refrigerant cycle system in which a compressor, a gas cooler, an expansion valve and an evaporator are sequentially connected in a cyclic form and a high pressure side is operated at a supercritical pressure, wherein the degree of opening of the expansion valve is adjusted based on the temperature and pressure of a refrigerant at an outlet of the evaporator so as to control the degree of superheat at the outlet of the evaporator. An abstract of the present invention is to make large the degree of superheat at the outlet of the evaporator by means of the expansion valve.